[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.861813] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.456139] random: sshd: uninitialized urandom read (32 bytes read) [ 18.764554] random: sshd: uninitialized urandom read (32 bytes read) [ 19.256073] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 24.904354] urandom_read: 1 callbacks suppressed [ 24.904358] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 04:16:41 parsed 1 programs [ 26.148760] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 04:16:43 executed programs: 0 [ 27.276803] IPVS: Creating netns size=2536 id=1 [ 27.397338] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 27.408614] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 27.450763] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 27.461939] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 27.504004] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 27.515559] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 27.527132] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 27.548577] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.040056] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.065652] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 28.071868] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 28.079365] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.266082] hrtimer: interrupt took 12869 ns [ 28.430850] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 28.439109] IP: [] l2tp_session_create+0xc60/0x16f0 [ 28.445788] PGD 1da247067 [ 28.448431] PUD 1da307067 PMD 0 [ 28.451959] [ 28.453581] Oops: 0002 [#1] PREEMPT SMP KASAN [ 28.458046] Dumping ftrace buffer: [ 28.461555] (ftrace buffer empty) [ 28.465235] Modules linked in: [ 28.468521] CPU: 0 PID: 4282 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 28.476112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.485445] task: ffff8801d56ee000 task.stack: ffff8801c2310000 [ 28.491475] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 28.500698] RSP: 0018:ffff8801c2317ac0 EFLAGS: 00010246 [ 28.506123] RAX: 0000000000000000 RBX: ffff8801d7b88c80 RCX: 1ffff1003aaddd1d [ 28.513377] RDX: 1ffff1003af71120 RSI: ffff8801d56ee8c8 RDI: ffff8801d7b88900 [ 28.520621] RBP: ffff8801c2317b60 R08: ffff8801d56ee8e8 R09: 0000000000000000 [ 28.527865] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d7b887d8 [ 28.535108] R13: 0000000000000000 R14: ffff8801d7b88780 R15: ffff8801c2317c78 [ 28.542362] FS: 00007fc1c01c6700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.550562] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.556486] CR2: 0000000000000080 CR3: 00000001d776c000 CR4: 00000000001606f0 [ 28.563745] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.571103] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.578353] Stack: [ 28.580483] 0000000000000000 0000000000000004 ffff8801d4f8bb80 ffff8801c2317d20 [ 28.588475] ffff8801d7b88780 ffff8801d7b88dd8 ffff8801d7b887d8 ffff8801d7b88dd0 [ 28.596459] ffff8801d7b88d30 ffff8801d7b887a0 0000000000000000 0000000000000000 [ 28.604458] Call Trace: [ 28.607025] [] pppol2tp_connect+0x10d7/0x18f0 [ 28.613148] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 28.619361] [] ? security_socket_connect+0x8f/0xc0 [ 28.626290] [] SYSC_connect+0x1b8/0x300 [ 28.631913] [] ? SYSC_bind+0x280/0x280 [ 28.637446] [] ? do_futex+0x17c0/0x17c0 [ 28.643060] [] SyS_connect+0x24/0x30 [ 28.648411] [] ? SyS_accept+0x30/0x30 [ 28.653850] [] do_syscall_64+0x1a6/0x490 [ 28.659547] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.666452] Code: 00 00 49 8d be 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 28.693828] RIP [] l2tp_session_create+0xc60/0x16f0 [ 28.700716] RSP [ 28.704323] CR2: 0000000000000080 [ 28.710120] ---[ end trace c9e65e2ceaabd901 ]--- [ 28.715198] Kernel panic - not syncing: Fatal exception [ 28.720895] Dumping ftrace buffer: [ 28.724424] (ftrace buffer empty) [ 28.728112] Kernel Offset: disabled [ 28.731713] Rebooting in 86400 seconds..